Hi again @kteirvine
You could try the following (if you haven't done it already)
On the 360 go to Settings > System > One Power - this can be either On or Off
If it's set to On then it enables connected devices to be turned on at the same time.
Also on the 360 under Settings > System > Standby power consumption > set this to Fast Start - it enables the 360 to wake up more quickly - it may be that if this is set to Active start or Eco start that your TV isn't seeing the 360 box in enough time so it's just starting on the digital tuner
Some TV's require you to go into the TV settings and select the HDMI port that you want you want the TV to wake up on (start on) automatically. I have an older Samsung which doesn't have this setting/function so it always starts on the inbuilt freeview channels
You may also have to set up your Sony TV to use HDMI-CEC so that it recognises other equipment is connected. HDMI-CEC has different names on various TV makes, I believe it's called Bravia Sync on Sony TV's.
HDMI-CEC tends to be very picky about the order that devices are plugged in, it sometimes won't recognise that other equipment is connected if it can't perform a handshake.
I'm hoping it won't come to this, but I had problems setting up a soundbar as the HDMI-CEC wasn’t working properly.
To fix it I had to remove all HDMI cables from the TV and turn off everything at the plug.
Then turn the TV on first. Next I had to plug the soundbar into HDMI port 2 on the TV and then power it on.
Then finally plug in my TV360 via the HDMI 1 power and power it on.
After doing that whenever I turn on my TV it starts on the 360 box channel and the sound works.
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